diff --git a/app/src/main/java/eu/kanade/tachiyomi/Migrations.kt b/app/src/main/java/eu/kanade/tachiyomi/Migrations.kt
index 7367de734..b62d0e850 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/Migrations.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/Migrations.kt
@@ -3,7 +3,6 @@ package eu.kanade.tachiyomi
 import eu.kanade.tachiyomi.data.backup.BackupCreatorJob
 import eu.kanade.tachiyomi.data.library.LibraryUpdateJob
 import eu.kanade.tachiyomi.data.preference.PreferencesHelper
-import eu.kanade.tachiyomi.data.preference.getOrDefault
 import eu.kanade.tachiyomi.data.updater.UpdaterJob
 import eu.kanade.tachiyomi.extension.ExtensionUpdateJob
 import java.io.File
@@ -18,7 +17,7 @@ object Migrations {
      */
     fun upgrade(preferences: PreferencesHelper): Boolean {
         val context = preferences.context
-        val oldVersion = preferences.lastVersionCode().getOrDefault()
+        val oldVersion = preferences.lastVersionCode().get()
         if (oldVersion < BuildConfig.VERSION_CODE) {
             preferences.lastVersionCode().set(BuildConfig.VERSION_CODE)
 
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.kt b/app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.kt
index 2de9ed1a9..fa7514daf 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/preference/PreferencesHelper.kt
@@ -12,6 +12,7 @@ import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.preference.PreferenceKeys as Keys
 import eu.kanade.tachiyomi.data.preference.PreferenceValues as Values
 import eu.kanade.tachiyomi.data.track.TrackService
+import eu.kanade.tachiyomi.data.track.anilist.Anilist
 import java.io.File
 import java.text.DateFormat
 import java.text.SimpleDateFormat
@@ -131,7 +132,7 @@ class PreferencesHelper(val context: Context) {
 
     fun lastUsedCategory() = rxPrefs.getInteger(Keys.lastUsedCategory, 0)
 
-    fun lastVersionCode() = rxPrefs.getInteger("last_version_code", 0)
+    fun lastVersionCode() = flowPrefs.getInt("last_version_code", 0)
 
     fun catalogueAsList() = rxPrefs.getBoolean(Keys.catalogueAsList, false)
 
@@ -150,7 +151,7 @@ class PreferencesHelper(val context: Context) {
 
     fun trackToken(sync: TrackService) = rxPrefs.getString(Keys.trackToken(sync.id), "")
 
-    fun anilistScoreType() = rxPrefs.getString("anilist_score_type", "POINT_10")
+    fun anilistScoreType() = rxPrefs.getString("anilist_score_type", Anilist.POINT_10)
 
     fun backupsDirectory() = rxPrefs.getString(Keys.backupDirectory, defaultBackupDir.toString())
 
@@ -194,7 +195,7 @@ class PreferencesHelper(val context: Context) {
 
     fun automaticExtUpdates() = flowPrefs.getBoolean(Keys.automaticExtUpdates, true)
 
-    fun extensionUpdatesCount() = rxPrefs.getInteger("ext_updates_count", 0)
+    fun extensionUpdatesCount() = flowPrefs.getInt("ext_updates_count", 0)
 
     fun lastExtCheck() = flowPrefs.getLong("last_ext_check", 0)
 
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/base/controller/BaseController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/base/controller/BaseController.kt
index b00153fa9..90d0664c2 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/base/controller/BaseController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/base/controller/BaseController.kt
@@ -12,8 +12,6 @@ import com.bluelinelabs.conductor.ControllerChangeType
 import com.bluelinelabs.conductor.RestoreViewOnCreateController
 import kotlinx.android.extensions.LayoutContainer
 import kotlinx.android.synthetic.clearFindViewByIdCache
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
 import timber.log.Timber
 
 abstract class BaseController(bundle: Bundle? = null) : RestoreViewOnCreateController(bundle),
@@ -43,8 +41,6 @@ abstract class BaseController(bundle: Bundle? = null) : RestoreViewOnCreateContr
         })
     }
 
-    val uiScope = CoroutineScope(Dispatchers.Main)
-
     override val containerView: View?
         get() = view
 
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/base/controller/DialogController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/base/controller/DialogController.kt
index 55d746f48..4388fa8d1 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/base/controller/DialogController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/base/controller/DialogController.kt
@@ -9,8 +9,6 @@ import com.bluelinelabs.conductor.RestoreViewOnCreateController
 import com.bluelinelabs.conductor.Router
 import com.bluelinelabs.conductor.RouterTransaction
 import com.bluelinelabs.conductor.changehandler.SimpleSwapChangeHandler
-import kotlinx.coroutines.CoroutineScope
-import kotlinx.coroutines.Dispatchers
 
 /**
  * A controller that displays a dialog window, floating on top of its activity's window.
@@ -26,8 +24,6 @@ abstract class DialogController : RestoreViewOnCreateController {
 
     private var dismissed = false
 
-    val uiScope = CoroutineScope(Dispatchers.Main)
-
     /**
      * Convenience constructor for use when no arguments are needed.
      */
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/main/MainActivity.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/main/MainActivity.kt
index 4f5938f35..084f019ea 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/main/MainActivity.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/main/MainActivity.kt
@@ -12,7 +12,6 @@ import com.bluelinelabs.conductor.RouterTransaction
 import eu.kanade.tachiyomi.Migrations
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.notification.NotificationReceiver
-import eu.kanade.tachiyomi.data.preference.getOrDefault
 import eu.kanade.tachiyomi.databinding.MainActivityBinding
 import eu.kanade.tachiyomi.extension.api.ExtensionGithubApi
 import eu.kanade.tachiyomi.ui.base.activity.BaseActivity
@@ -30,10 +29,12 @@ import eu.kanade.tachiyomi.ui.recent.history.HistoryController
 import eu.kanade.tachiyomi.ui.recent.updates.UpdatesController
 import eu.kanade.tachiyomi.ui.source.SourceController
 import eu.kanade.tachiyomi.ui.source.global_search.GlobalSearchController
+import eu.kanade.tachiyomi.util.lang.launchInUI
 import java.util.Date
 import java.util.concurrent.TimeUnit
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.launch
 import timber.log.Timber
 
@@ -141,10 +142,11 @@ class MainActivity : BaseActivity() {
                 ChangelogDialogController().showDialog(router)
             }
         }
-        preferences.extensionUpdatesCount().asObservable().subscribe {
-            setExtensionsBadge()
-        }
+
         setExtensionsBadge()
+        preferences.extensionUpdatesCount().asFlow()
+            .onEach { setExtensionsBadge() }
+            .launchInUI()
     }
 
     override fun onNewIntent(intent: Intent) {
@@ -159,7 +161,7 @@ class MainActivity : BaseActivity() {
     }
 
     private fun setExtensionsBadge() {
-        val updates = preferences.extensionUpdatesCount().getOrDefault()
+        val updates = preferences.extensionUpdatesCount().get()
         if (updates > 0) {
             binding.bottomNav.getOrCreateBadge(R.id.nav_more).number = updates
         } else {
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/more/MoreController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/more/MoreController.kt
index 7c3cefb5a..70a426e88 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/more/MoreController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/more/MoreController.kt
@@ -3,7 +3,6 @@ package eu.kanade.tachiyomi.ui.more
 import androidx.preference.PreferenceScreen
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.preference.PreferencesHelper
-import eu.kanade.tachiyomi.data.preference.getOrDefault
 import eu.kanade.tachiyomi.ui.base.controller.RootController
 import eu.kanade.tachiyomi.ui.base.controller.withFadeTransaction
 import eu.kanade.tachiyomi.ui.download.DownloadController
@@ -34,7 +33,7 @@ class MoreController : SettingsController(), RootController {
             titleRes = R.string.label_extensions
             iconRes = R.drawable.ic_extension_24dp
             iconTint = tintColor
-            setBadge(Injekt.get<PreferencesHelper>().extensionUpdatesCount().getOrDefault())
+            setBadge(Injekt.get<PreferencesHelper>().extensionUpdatesCount().get())
             onClick {
                 router.pushController(ExtensionController().withFadeTransaction())
             }
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/PagerConfig.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/PagerConfig.kt
index a95d29c64..14e458f7c 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/PagerConfig.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/pager/PagerConfig.kt
@@ -2,9 +2,9 @@ package eu.kanade.tachiyomi.ui.reader.viewer.pager
 
 import com.f2prateek.rx.preferences.Preference
 import eu.kanade.tachiyomi.data.preference.PreferencesHelper
+import eu.kanade.tachiyomi.ui.reader.viewer.ViewerConfig
 import eu.kanade.tachiyomi.util.lang.addTo
 import rx.subscriptions.CompositeSubscription
-import eu.kanade.tachiyomi.ui.reader.viewer.ViewerConfig
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
 
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonConfig.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonConfig.kt
index 98fa704cf..471b817db 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonConfig.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/reader/viewer/webtoon/WebtoonConfig.kt
@@ -2,9 +2,9 @@ package eu.kanade.tachiyomi.ui.reader.viewer.webtoon
 
 import com.f2prateek.rx.preferences.Preference
 import eu.kanade.tachiyomi.data.preference.PreferencesHelper
+import eu.kanade.tachiyomi.ui.reader.viewer.ViewerConfig
 import eu.kanade.tachiyomi.util.lang.addTo
 import rx.subscriptions.CompositeSubscription
-import eu.kanade.tachiyomi.ui.reader.viewer.ViewerConfig
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get